Drill bit



Sept. 16 1924- w. G. CHRISTIAN DRILL BIT F1104 Jan. 29 1923 III a a drill bit of the character describe Patented Sept. 16, 1924.

PATENT orrlca.

WALTON G. CHRISTIAN, 0F HOUSTON, TEXAS.

DRILL BIT.

Application filed January 29, 1923. Serial No. 615,578.

To all whom it may concern:

Be it known that I; WALTON G. Crnus- TIAN citizen of the United States, residin at l-louston, in the county of Harris an State of Texas, have invented certain new and useful Improvements in Drill Bits, of which the following is a specification.

This invention relates to new and useful im rovements in a drill bit.

e object of the invention is to rovide which is formed-with an elongated flat blade. hav-' ing asubstantially cylindrical center, said c lindrical portion extending axially relative to said blade and being provided with a single water course from the upper end of the bit shank down through said cylindrical portion, said water course terminating at its lower end in suitable discharge ports through which water may be discharged on opposite sides of the blade toward the cuttin points of the bit.

other object of the invention is to provide a bit of the character described'which is ofsuch formation that it may be sharpened from time to time as it wears away,

thus renewed for reuse and the life of the bit thus'materially lengthened.

A still further object of the invention is to provide a bit for drilling wells having a relatively large centrally located water course, extending from the upper end thereof downwardlyl and terminating in restricted ports t rough which water may be cast on o 'posite sides of the blades or cutters forming art of the bit.

A further eature of the invention resides in the provision of a bit of the character described having a single central water course extending down alongthe axial line of the bit blade and terminating in discharge ports at its lower end, the upper end of said water course-being protected by aback pressure valve which will preventthe inflow of water or inud through said ports thus preventing the clogging of the water course or .ports.

With the above'and other objects in viewthe invention has particular relation to certain novel features of construction, operational construction which tion and arrangement of parts, an example of which is given in this specification and illustrated in the accompanying drawings, wherein Figure 1 is a side view of the bit.

Figure 2 is an edge view thereof shown partly section. v Figure 3 is an edge view of the bit after thas become partly worn away and has been sharpened""for reuse, shown partly in section. 1

Fi re 4 is a cross sectional view taken on the l ne 4 4 of Figure 1 and,

Figure 5 is an upper end view of the bit.

In the drawings the numeral 1 designates the body of the bit whose upper end is rethickness. Along its central or axial-line the body is'formed cylindrical as at 4, said cylindrical portion being formed integrally with the rest of the body and extending from the shank down near the cutting blades 3. This formation materially I strengthensthe blade along the. axial or ecu-'- tral line and prevents it from splitting. or

twisting of. There is .a water course 5 ex-.

tending from the upper end of the shank down through said the lower end thereo On, opposite sides of the body the lower end of the cylindrical portion 4 has the discharge ports 6, 6 through which the water is cast onto the 0pposite sides of the bit and these ports are deflected toward the respective cutting points 3, 3 so as to throw thewater onto said cutting points, all of which is illustrated in Figure 1. The water is forced to the. cutting oints of the bit under considerable hydrau ic ressure so as to carry awa the cuttings 30 the bit. The upper end '0 the bore 5v is enlarged and in said enlarged portion cfylindrical portion to,

there is a back pressure valve 7 of convenrmits the water 7 to flow down through said watercourse 5' from the drill stem, but prevents any; back flow of fluid up through said water course so that mud or other clogging material can not enter into and plug up the discharge ports 6. llhis valve mechamsm is not indisn'sable, but may be used if desired. As the lades wear away and the bit requires sharpening the lower end of the cylindrical portion 4 may be flattened to conform to the contour of the rest of the bit and new 'discharge ports .6 punched therein and the.

blades 3, 3 may then be reformed and sharpened and practically a new'bit produced. This process may be repeated as often as required until the body of the bit is entirely worn away. 7.

The central water course 5 may be extended any desired distance downwardly through the bit, but at its lower end terminates in restricted outlet ports 6, as above described through which the water is discharged on opposite sides of the blade. In many cases the valve 7 will not be used, and as the bit descends through the mud or mud laden water, the water course 5 may become plugged up, but the pressure from the pump when drilling starts will force this plugging material out through the ports 6, and when one of said ports is open, the pump pressure while somewhat relieved, is still sufficient, on account ofthe short length of the ports, to clean out the other one. By the pump pressure, the water course 5 will necessarily m cleansed out in order to relieve one of the ports, and the other port will also be readily unstopped by the pressure. lit often hap pens that when the independent water courses are used, and they become clogged up, the pump pressurewill force the clogging material out through one of said water courses, and the pressure will thereby be relieved to such an extent that the other water courses will remain clogged, and water will be supplied to only one side of-the bit.

What ll claim is 1. A drill bit including an elongated fiat relatively thin body, having a centrally located vertical rib on each side formed integrally therewith, and whose lower end is formed with cutting blades, said bit having a single water course which extends from .the upper end thereof and continues down wit said ribs near-the lower end thereof, the lower ends of the ribs being provided with water ports through'which water may be discharged on opposite sides of saidbody the upper end of said water course being enlarged and a back pressurevalve located in said enlarged portion.

2. A drill bit includingan elongated flat body, a reinforcing vertical rib on o posite sides of said bod said ribs being ormed inte lly with t e body and tormin an axia cylindrical section for the body wch extends! from the bit shank to near the lower.

end of the bit, cutting blades into which the lower end of said bit is formed, said bit having a vertical watercourse the upper end of which is enlarged leading from the upper end thereof down through said cylindrical section, said water course at its lower end terminating in restricted diverging discharge ports through which water 18 discharged on opposite sides or the body toward the respective cutting blades and a back pressure valve located in said enlarged ortlo'n.

3. A drill bit including an elongated flat body, a reinforcing vertical rib on opposite sides of said body, said ribs being formed integrally with the body and forming an axial cylindrical sectionfor the body which extends from the bit shank to near the lower end of the bit, cutting blades into which the lower end of said bit is formed, said bit having a vertical water course the upper end of which is enlarged leading from the upper end thereof down through said cylindrical section, said water course at its lower end terminating in restricted diverging discharge ports through which water is discharged on opposite sides of the body toward the respective cutting blades, and a back pressure valve controlling said water course said back pressure valve being located at the upper end of said water course in said bit.

t. A drill bit including an elongated flat body having a centrally located vertical cylindrical portion formed integrally with the body, said bit having a single water course leading from the upper end thereof down through said cylindrical portion and terminating in restricted discharge ports which lead from the lower end thereof and through which water ma be discharged on opposite sides of said he y and a back ressure valve located in the head of sai bit.

5. A drill bit of the fish-tail type including an elongated flat bod having a centrally located vertical cy indrical portion formed integrally with the body extending from the lower end of the shank to near the lower end ofl said bit, said bit hav'ing a single water course leading from the upper end thereof down through said cylindrical portion and terminating in restricted discharge ports which lead from the lower end thereof and through which water may be discharged on opposite sides of said bod and a back pressure valve located in Sltldl shank controlling said assageway.

6.1%. drill bit inclu ing a shank, a flat blade integral with the shank, lengthwise centrally located oppositely disposed ribs, one on each side of said blade, cutting members carried by the lower end of the blade, said bit having a single relatively large unobstructed water course, leading tro n its upper end downwardly therethrough bename to this specification in the presence tween said ribs and terminating near its of two subscribing witnesses. lower end in restricted discharge parts which lead through the lower ends of the respec- WALTON G. CHRISTIAN. 5 tive ribs and discharge water on opposite Witnesses:

sides of said cutting members. W. H. DUNLAY,

In testimony whereof I have signed my E V. HARDWAY. 

